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/* Copyright 2004 Roger Dingledine */
/* See LICENSE for licensing information */
/* $Id$ */
/* This module implements the hidden-service side of rendezvous functionality.
*/
#include "or.h"
/* Represents the mapping from a virtual port of a rendezvous service to
* a real port on some IP.
*/
typedef struct rend_service_port_config_t {
uint16_t virtual_port;
uint16_t real_port;
uint32_t real_address;
} rend_service_port_config_t;
/* Represents a single hidden service running at this OP.
*/
typedef struct rend_service_t {
/* Fields specified in config file */
char *directory;
smartlist_t *ports;
/* Other fields */
crypto_pk_env_t *private_key;
char service_id[REND_SERVICE_ID_LEN+1];
} rend_service_t;
/* A list of rend_service_t.
*/
static smartlist_t *rend_service_list = NULL;
static void rend_service_free(rend_service_t *config)
{
int i;
if (!config) return;
tor_free(config->directory);
for (i=0; i<config->ports->num_used; ++i) {
tor_free(config->ports->list[i]);
}
smartlist_free(config->ports);
if (config->private_key)
crypto_free_pk_env(config->private_key);
}
static void rend_service_free_all(void)
{
int i;
if (!rend_service_list) {
rend_service_list = smartlist_create();
return;
}
for (i=0; i < rend_service_list->num_used; ++i) {
rend_service_free(rend_service_list->list[i]);
}
smartlist_free(rend_service_list);
rend_service_list = smartlist_create();
}
static void add_service(rend_service_t *service)
{
int i;
rend_service_port_config_t *p;
struct in_addr addr;
if (!service->ports->num_used) {
log_fn(LOG_WARN, "Hidden service with no ports configured; ignoring.");
rend_service_free(service);
} else {
smartlist_set_capacity(service->ports, service->ports->num_used);
smartlist_add(rend_service_list, service);
log_fn(LOG_INFO,"Configuring service with directory %s",service->directory);
for (i = 0; i < service->ports->num_used; ++i) {
p = (rend_service_port_config_t *) service->ports->list[i];
addr.s_addr = htonl(p->real_address);
log_fn(LOG_INFO,"Service maps port %d to %s:%d",
p->virtual_port, inet_ntoa(addr), p->real_port);
}
}
}
/* Format: VirtualPort (IP|RealPort|IP:RealPort)?
* IP defaults to 127.0.0.1; RealPort defaults to VirtualPort.
*/
static rend_service_port_config_t *parse_port_config(const char *string)
{
int virtport, realport, r;
struct in_addr addr;
char *endptr, *colon, *addrstring;
rend_service_port_config_t *result;
virtport = (int) strtol(string, &endptr, 10);
if (endptr == string) {
log_fn(LOG_WARN, "Missing port in hidden service port configuration");
return NULL;
}
if (virtport < 1 || virtport > 65535) {
log_fn(LOG_WARN, "Port out of range in hidden service port configuration");
return NULL;
}
string = endptr + strspn(endptr, " \t");
if (!*string) {
/* No addr:port part; use default. */
realport = virtport;
addr.s_addr = htonl(0x7F000001u);
} else {
colon = strchr(string, ':');
if (colon) {
/* Try to parse addr:port. */
addrstring = tor_strndup(string, colon-string);
r = tor_inet_aton(addrstring, &addr);
tor_free(addrstring);
if (!r) {
log_fn(LOG_WARN,"Unparseable address in hidden service port configuration");
return NULL;
}
realport = strtol(colon+1, &endptr, 10);
if (*endptr) {
log_fn(LOG_WARN,"Unparseable or missing port in hidden service port configuration.");
return NULL;
}
} else if (strchr(string, '.') && tor_inet_aton(string, &addr)) {
/* We have addr; use deafult port. */
realport = virtport;
} else {
/* No addr:port, no addr -- must be port. */
realport = strtol(string, &endptr, 10);
if (*endptr) {
log_fn(LOG_WARN, "Unparseable of missing port in hidden service port configuration.");
return NULL;
}
addr.s_addr = htonl(0x7F000001u); /* Default to 127.0.0.1 */
}
}
if (realport < 1 || realport > 65535) {
log_fn(LOG_WARN, "Port out of range in hidden service port configuration.");
return NULL;
}
result = tor_malloc(sizeof(rend_service_port_config_t));
result->virtual_port = virtport;
result->real_port = realport;
result->real_address = (uint32_t) ntohl(addr.s_addr);
return result;
}
/* Set up rend_service_list, based on the values of HiddenServiceDir and
* HiddenServicePort in 'options'. Return 0 on success and -1 on
* failure.
*/
int rend_config_services(or_options_t *options)
{
struct config_line_t *line;
rend_service_t *service = NULL;
rend_service_port_config_t *portcfg;
rend_service_free_all();
for (line = options->RendConfigLines; line; line = line->next) {
if (!strcasecmp(line->key, "HiddenServiceDir")) {
if (service)
add_service(service);
service = tor_malloc_zero(sizeof(rend_service_t));
service->directory = tor_strdup(line->value);
service->ports = smartlist_create();
} else {
assert(!strcasecmp(line->key, "HiddenServicePort"));
if (!service) {
log_fn(LOG_WARN, "HiddenServicePort with no preceeding HiddenServiceDir directive");
rend_service_free(service);
return -1;
}
portcfg = parse_port_config(line->value);
if (!portcfg) {
rend_service_free(service);
return -1;
}
smartlist_add(service->ports, portcfg);
}
}
if (service)
add_service(service);
return 0;
}
/* Load and/or generate private keys for all hidden services. Return 0 on
* success, -1 on failure.
*/
int rend_service_init_keys(void)
{
int i;
rend_service_t *s;
char fname[512];
char buf[128];
for (i=0; i < rend_service_list->num_used; ++i) {
s = (rend_service_t*) rend_service_list->list[i];
if (s->private_key)
continue;
/* Check/create directory */
if (check_private_dir(s->directory, 1) < 0)
return -1;
/* Load key */
if (strlcpy(fname,s->directory,512) >= 512 ||
strlcat(fname,"/private_key",512) >= 512) {
log_fn(LOG_WARN, "Directory name too long: '%s'", s->directory);
return -1;
}
s->private_key = init_key_from_file(fname);
if (!s->private_key)
return -1;
/* Create service file */
if (rend_get_service_id(s->private_key, s->service_id)<0) {
log_fn(LOG_WARN, "Couldn't encode service ID");
return -1;
}
if (strlcpy(fname,s->directory,512) >= 512 ||
strlcat(fname,"/hostname",512) >= 512) {
log_fn(LOG_WARN, "Directory name too long: '%s'", s->directory);
return -1;
}
sprintf(buf, "%s.onion\n", s->service_id);
if (write_str_to_file(fname,buf)<0)
return -1;
}
return 0;
}
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